Fix and refactor Infinite scrolling with vanilla JS

[harireddy7]

Title and Issue number

Title : Fix scrolling issues on larger screen in Infinite scrolling with vanilla JS

Issue No. : #397

Code Stack : Javascript

Close #397

Checklist:

• I have mentioned the issue number in my Pull Request.
• I have commented my code, particularly in hard-to-understand areas
• I have created a helpful and easy to understand README.md
• I have updated the Index.html file for my contribution

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